/**
 * Render one `set -x` trace line for an expanded simple command.
 *
 * Words are shown post-expansion with bash's `+ ` prefix; words that
 * need it are single-quoted like bash's trace output.
 */
export declare function traceCommand(words: readonly string[]): Uint8Array;
/** Render one `set -x` trace line for a scalar assignment. */
export declare function traceAssignment(key: string, val: string, append: boolean): Uint8Array;
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